Contemporary Geodesy: Proceedings of a Conference Held at by Charles A. Whitten, Kenneth H. Drummond

By Charles A. Whitten, Kenneth H. Drummond

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Published by way of the yank Geophysical Union as a part of the Geophysical Monograph Series.

The winning launchings of high-altitude rockets and synthetic Earth satellites have opened a brand new period within the selection of geophysical information. the applying of those new concepts would require the mixed principles, studies, and companies of scientists in a large choice of disciplines. for instance, any efforts within the choice of geodetic facts will unavoidably draw jointly numerous fields of activity open air of geodesy, corresponding to astronomy, rocketry, and electronics, to call a number of.

In acceptance of this, many American geodesists expected the necessity of a convention on modern Geodesy for the interchange of information and concepts between scientists in definite fields with regards to the hot area age. the aim of any such convention was once now not only to orient different scientists in sleek geodesy, yet simply as importantly to enlighten the geodesist in these sciences required in area program to his challenge.

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Sample text

Air Force has made a connection across the North Atlantic from Canada to Norway. This connection is a network of lines measured by electronic methods. Other trilateration networks connect Venezuela, Puerto Rico, and Cuba to the Florida triangulation. Results of these connections are not available. By obtaining sufficient ties between continental datums already established, and by cooperation from all the countries involved, a new world datum including all networks would furnish valuable information concerning the shape and size of the Earth.

We should obviously measure from a point around the horizon. That is the point Johns is talking about. Now one more point. When Air Force pilots fly in the north pole area they have practically eliminated the north. I believe that the concept of north is perhaps an idea which is of historical and cultural value but should be liquidated in Vol. 4 modern geodesy. In ancient times, even fifty years ago, one determined azimuth from the north pole in an unambiguous way because this was the only point in the sky which could be specified.

If the network is tion are large, the observed directions should be then extended based on a datum involving all corrected for deflection of the vertical. To comastronomic positions, and the deflections are ab- pute this correction it is necessary to observe normal, considering the terrain, the adopted astronomic positions. When the angle of elevation between two points is approximately six deellipsoid was a poor choice. A. good example of an erroneous ellipsoid is the grees and the difference between the perpendicuEverest, on which the surveys of India are based.

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